Correlated evolution of larval development, egg size, and genome size across two genera of snapping shrimp

Across plants and animals, genome size is often correlated with life history traits: large genomes are correlated with larger seeds, slower development, larger body size, and slower cell division. Among decapod crustaceans, caridean shrimps are among the most variable both in terms of genome size variation and life history characteristics such as larval development mode and egg size, but the extent to which these traits are associated in a phylogenetic context is largely unknown. In this study, we examine correlations among egg size, larval development, and genome size in two different genera of snapping shrimp, Alpheus and Synalpheus, using phylogenetically informed analyses. In both Alpheus and Synalpheus, egg size is strongly linked to larval development mode: species with abbreviated development had significantly larger eggs than species with extended larval development. We produced the first comprehensive dataset of genome size in Alpheus (n = 37 species), and demonstrated that gen...

在动植物类群中，基因组大小通常与生活史性状存在显著关联：基因组较大的类群往往对应更大的种子、更迟缓的发育速率、更大的体型以及更缓慢的细胞分裂过程。在十足目甲壳动物中，真虾下目（Caridea）虾类是基因组大小变异与幼体发育模式、卵大小等生活史特征多样性最高的类群之一，但目前学界对这些性状在系统发育背景下的关联程度仍知之甚少。本研究以枪虾属（Alpheus）与Synalpheus属两类枪虾为研究对象，采用考虑系统发育关系的分析方法，探究卵大小、幼体发育模式与基因组大小三者之间的关联。在枪虾属与Synalpheus属中，卵大小均与幼体发育模式显著相关：发育过程简化的物种，其卵大小显著大于幼体发育周期延长的物种。本研究构建了首个枪虾属（Alpheus）基因组大小的综合数据集（共涵盖37个物种），并证实了基因组...